What if I put a patio in after the sprinklers and sod

If we know about the patio prior to installing the system, we can plan around it accordingly.  You still may have to move a few heads if you change your dimensions, but those costs are relatively minimal.

If you did not plan for it, typically it still is not that big of a deal moving some lines and heads.  IF you do a complete overhaul of your backyard, you may have to move the whole system around or re-do the back.